//
//  PrettyDate.m
//  敢唆嘛!
//
//  Created by 教主 on 15/11/27.
//  Copyright © 2015年 zms. All rights reserved.
//

#import "PrettyDate.h"

@implementation PrettyDate

//- (NSDate *)dateFromString:(NSString *)dateString{
//    
//    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
//    [dateFormatter setDateFormat: @"yyyy-MM-dd HH:mm:ss"];
//    NSDate *destDate= [dateFormatter dateFromString:dateString];
//    return destDate;
//}

- (NSString *)prettyDateWithReference:(NSDate *)reference {
    NSString *suffix = @"ago";
    
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    formatter.dateFormat = @"yyyy-MM-dd HH:mm:ss";//日期格式
    //   formatter.timeZone = [NSTimeZone systemTimeZone];//给定系统所在的时区
    NSString *dateS = [formatter stringFromDate:[NSDate date]];
    NSDate *date = [formatter dateFromString:dateS];
    
    float different = [reference timeIntervalSinceDate:date];
    if (different < 0) {
        different = -different;
        suffix = @"发布";
    }
    
    // days = different / (24 * 60 * 60), take the floor value
    float dayDifferent = floor(different / 86400);
    
    int days   = (int)dayDifferent;
    int weeks  = (int)ceil(dayDifferent / 7);
    int months = (int)ceil(dayDifferent / 30);
    int years  = (int)ceil(dayDifferent / 365);
    
    // It belongs to today
    if (dayDifferent <= 0) {
        // lower than 60 seconds
        if (different < 60) {
            return @"刚才";
        }
        
        // lower than 120 seconds => one minute and lower than 60 seconds
        if (different < 120) {
            return [NSString stringWithFormat:@"1分钟前 %@", suffix];
        }
        
        // lower than 60 minutes
        if (different < 60 * 60) {
            return [NSString stringWithFormat:@"%d 分钟前 %@", (int)floor(different / 60), suffix];
        }
        
        // lower than 60 * 2 minutes => one hour and lower than 60 minutes
        if (different < 7200) {
            return [NSString stringWithFormat:@"1小时前 %@", suffix];
        }
        
        // lower than one day
        if (different < 86400) {
            return [NSString stringWithFormat:@"%d 小时前 %@", (int)floor(different / 3600), suffix];
        }
    }
    // lower than one week
    else if (days < 7) {
        return [NSString stringWithFormat:@"%d 天前%@ %@", days, days == 1 ? @"" : @"前", suffix];
    }
    // lager than one week but lower than a month
    else if (weeks < 4) {
        return [NSString stringWithFormat:@"%d 星期前%@ %@", weeks, weeks == 1 ? @"" : @"前", suffix];
    }
    // lager than a month and lower than a year
    else if (months < 12) {
        return [NSString stringWithFormat:@"%d 月前%@ %@", months, months == 1 ? @"" : @"前", suffix];
    }
    // lager than a year
    else {
        return [NSString stringWithFormat:@"%d 年前%@ %@", years, years == 1 ? @"" : @"前", suffix];
    }
    
    return self.description;
}
@end
